Digitally-implemented demodulator

Details Digitally-implemented demodulator Digitally-implemented demodulator

2005-07-05

2005-07-05

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Receivers

Angle modulation

C375S222000, C375S150000, C375S324000, C365S042000, C341S155000, C327S096000, C329S336000

Reexamination Certificate

active

06914946

ABSTRACT:
A digitally implemented demodulator. A frequency-modulated signal is applied to a limiting amplifier such that the signal amplitude is fixed at a constant level. The signal is undersampled and quadrature demodulated. The demodulator generates the cross-product of the baseband complex envelope to recover the original modulating signal. A digital Frequency Shift Keyed signal can be further recovered by applying the recovered signal to a data slicer to square-up the signal, and a matched filter for improved error resistance.

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Shoji Konda et al., “Significant Digit Requirement for FM Demodulation Using Digital Signal Processing,” Electronics and Communications in Japan, Part I, vol. 73 (Feb. 1990).

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